linux-kernel - Re: [PATCH v2 1/2] dt-bindings: phy: mediatek: Add YAML schema for PCIe PHY

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Date:   Fri, 18 Mar 2022 14:51:34 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Jianjun Wang <jianjun.wang@...iatek.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chen-Yu Tsai <wenst@...omium.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        rex-bc.chen@...iatek.com, randy.wu@...iatek.com,
        jieyy.yang@...iatek.com, chuanjia.liu@...iatek.com,
        qizhong.cheng@...iatek.com, jian.yang@...iatek.com
Subject: Re: [PATCH v2 1/2] dt-bindings: phy: mediatek: Add YAML schema for
 PCIe PHY

On 18/03/2022 12:12, AngeloGioacchino Del Regno wrote:
> Il 18/03/22 10:54, Jianjun Wang ha scritto:
>> Add YAML schema documentation for PCIe PHY on MediaTek chipsets.
>>
>> Signed-off-by: Jianjun Wang <jianjun.wang@...iatek.com>
>> ---
>>   .../bindings/phy/mediatek,pcie-phy.yaml       | 75 +++++++++++++++++++
>>   1 file changed, 75 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/phy/mediatek,pcie-phy.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/phy/mediatek,pcie-phy.yaml b/Documentation/devicetree/bindings/phy/mediatek,pcie-phy.yaml
>> new file mode 100644
>> index 000000000000..868bf976568b
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/phy/mediatek,pcie-phy.yaml
>> @@ -0,0 +1,75 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/phy/mediatek,pcie-phy.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: MediaTek PCIe PHY
>> +
>> +maintainers:
>> +  - Jianjun Wang <jianjun.wang@...iatek.com>
>> +
>> +description: |
>> +  The PCIe PHY supports physical layer functionality for PCIe Gen3 port.
>> +
>> +properties:
>> +  compatible:
>> +    const: mediatek,mt8195-pcie-phy
> 
> Since I don't expect this driver to be only for MT8195, but to be extended to
> support some more future MediaTek SoCs and, depending on the number of differences
> in the possible future Gen4 PHYs, even different gen's, I propose to add a generic
> compatible as const.
> 
> So you'll have something like:
> 
> - enum:
>      - mediatek,mt8195-pcie-phy
> - const: mediatek,pcie-gen3-phy

I am not sure if this is a good idea. How sure are you that there will
be no different PCIe Gen3 PHY not compatible with this one?


Best regards,
Krzysztof